Secondary battery



FIG. 1 is a perspective view of a secondary battery showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left-side elevational view thereof;

FIG. 5 is a right-side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an enlarged cross section view thereof, taken along line 8-8 in FIG. 2 .

The broken lines in FIG. 8 depict portions of the secondary battery that form no part of the claimed design. 

CLAIM The ornamental design for a secondary battery, as shown and described. 